... tin plating, nickel plating 3) mateial:zinc,stainless steel,iron 1.We are the factory specializing in the stamping ... machines, welding machine, polish machines...Processed materialstainless steel, copper, carbon steel (according to customer's requirement)Making processStamping,deep ... strict quality control from producing to delivery. metal steel ball,stainless steel balls,10mm stainless steel ball